# FMMT618-JSM

**JSMSEMI** · Bipolar (BJT) · SOT-23

FMMT618-JSM from JSMSEMI, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BASE | input | Base of the NPN transistor; IB max 0.5 A, VEBO max 5 V, base-emitter on voltage max 1 V at IC=2.5 A, VCE=2 V. |
| 2 | EMITTER | passive | Emitter of the NPN transistor; emitter-base voltage rating 5 V. |
| 3 | COLLECTOR | passive | Collector of the NPN transistor; VCEO/VCBO 20 V, continuous IC 2.5 A, total dissipation 350 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `FMMT618-JSM`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `fmmt618-jsm-etched.step` / `fmmt618-jsm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fmmt618-jsm.step` / `fmmt618-jsm.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [JSMSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603591369810464768) (4 pp, sha256 `281fdc15a7b162dc`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/fmmt618-jsm-datasheet.pdf)